This module presents the major components of a complete (albeit trivial) vision system.
Advantages
Disadvantages
You can see the effect of thresholding by moving the slider in this applet.
The slider sets the threshold and the image on the right shows the result
and binary image. In this case, white pixels are above the threshold and
black are below it.
[ Aids to threshold selection: histograms. ]
Author:: Andrew Fitzgibbon at the Department of Artificial Intelligence, University of Edinburgh
THRESHOLDING
In the simplest case, an image may consist of a single object or several
separated objects of relatively high intensity, viewed against a background
of relatively low intensity. This allows figure/ground separation
by thresholding.
In order to create the two-valued binary image a simple threshold may be
applied so that all the pixels in the image plane are classified into
object and background pixels.
A binary image function can then be constructed such that pixels above the
threshold are foreground (``1'') and below the threshold are background
(``0'').